Interactivity & Widgets

Since Slope works on top of polyscope, you keep the control over the camera with usual mouse control.

To make interactive presentations, you can use ImGui widgets as a primitive:

    float* f = new float(1); // make sure to allocate on heap

    show << Point::Add([f](TimeObject t) {
        scalar th = (*f)*t.inner_time;
        return vec(cos(th),sin(th),0);
    });

    show << ImGuiWidgets::Add([f]() {
        ImGui::SliderFloat("speed",f,0,10);
    },"window name");

ImGuiWidgets::Add(const std::function<void()>& callback,std::string window_name)

Widgets, or parameters ?

A widget is for values the audience should see you change, and costs a heap-allocated value and a callback.

A value you are only tuning while preparing is a tunable parameter instead: one line, a slider in the Tuner panel, saved to disk. Anything with more structure than a number is a Lua snippet.